Key for Potalia Aubl.

1Corolla concolorous white or greenish white, very rarely partially green, with lobes bent towards center and partially closing flower at anthesis; fruit globose to slightly turbinate, the sterile apical part less distinct and confluent with a less distinct thickened ring
1'Corolla green (rarely yellow), lobe margins and lower tube sometimes yellow, with lobes erect or slightly spreading at anthesis; fruit ovoid to obpyriform, often acorn-shaped (sometimes globose), the sterile apical part distinctly protruding, a distinct thickened ring usually present above calyx lobes